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Stockholders' Equity And Stock-Based Compensation (Schedule of Stock-Based Compensation By Classification) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 27, 2015	Mar. 28, 2014	Mar. 27, 2015	Mar. 28, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 16,667us-gaap_AllocatedShareBasedCompensationExpense	$ 17,753us-gaap_AllocatedShareBasedCompensationExpense	$ 34,509us-gaap_AllocatedShareBasedCompensationExpense	$ 32,807us-gaap_AllocatedShareBasedCompensationExpense
Benefit from income taxes	(4,890)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(5,290)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(10,041)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(9,686)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total stock-based compensation, net of tax	11,777us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	12,463us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	24,468us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	23,121us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost of products [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	224us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	217us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	470us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	407us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cost of services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	115us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	113us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	237us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	200us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,938us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	4,889us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	10,212us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	9,196us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	5,576us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	6,332us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	11,485us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	11,357us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 5,814us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 6,202us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 12,105us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 11,647us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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